Description
Compute (right - left) modulo 2^32 and require a strictly positive span below 2^31.
TCP sequence and timestamp fields wrap in a 32-bit space. A modular distance gives a local displacement; ordering near half the space and multiple wraps requires additional context.
Compute (right - left) modulo 2^32 and require a strictly positive span below 2^31.
When to use this tool
Use TCP Sack Block Relative Span when you need a bounded sequence-space distance or interval relationship.
How to use the tool and how it works
- Enter left, right. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read bytes, wraps. Inspect wraps before interpreting the associated values.
Compute (right - left) modulo 2^32 and require a strictly positive span below 2^31. Set wraps when right is numerically less than left.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| left | Left | Required. Safe integer; minimum 0; maximum 4294967295. |
| right | Right | Required. Safe integer; minimum 0; maximum 4294967295. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| bytes | Bytes | Required. Finite number. |
| wraps | Wraps | Required. Boolean. |
{
"input": {
"left": 4294967290,
"right": 4
},
"output": {
"bytes": 10,
"wraps": true
}
}Limitations and assumptions
- Zero-length and half-space-or-larger intervals are rejected rather than assigned an ordering.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Combine sequence arithmetic with connection state, packet chronology, and explicit wrap epochs where available.
References
Similar or alternative tools
- TCP Sack Duplicate Block Order Classifier
Calculate the first SACK block's modular span and the backward distance from its right edge to the cumulative acknowledgment.
- TCP Retransmission Sequence Overlap
Place secondStart within a signed half-space of firstStart, reject the exact half-space tie, and intersect the resulting half-open intervals.